Harrow tooth



Aug. 12, 1952 T. GRAY HARROW TOOTH Filed Nov. 9, 1946 FIG. I.

FIG.2.

/n ven for: 4

Thomas Gray Patented Aug. 12, 1952 UNITED STATES FATENT OFFICE HARROWTOQTH Thomas Gray, Ituna, Saskatchewan, Canada Application November 9,1946, Serial No. 708,899

1 Claim. 1

My invention relates to improvements in harrow teeth, an object being toprovide a device of the character herewithin described consisting of amale portion permanently secured to the harrow framework, and a femalepoint which is removable by the user when in need of resharpening. andwhich may be discarded when worn out and replaced by a new point withoutthe necessity for unscrewing and screwing up.

A further object of the present invention contemplates a saving to theuser over the conventional practice which consists in taking an entireharrow to the blacksmith where the teeth are removed, sharpened andreplaced, in favour of the procedure which would consist in the usersremoval and replacement of the female point portions so that theblacksmith would only be called upon to do the actual sharpening.

With the foregoing objects in view, and such other objects andadvantages as will become apparent to those skilled in the art to whichthis invention relates as this specification proceeds, my inventionconsists essentially in the arrangement and construction of parts all ashereinafter more particularly described, reference being had to theaccompanying drawings in which:

Figure l is a side view of my improved harrow tooth with certain partsshown in section.

Figure 2 is a fragmentary exploded perspective view of the junctionbetween the harrow point and attaching portion.

In the drawings like characters of reference indicate correspondingparts in the different figures.

My harrow tooth consists of two main parts which I designate as the maleportion I, and the removable, female point 2, it being understood thatthe portion l is secured to a harrow framework by means of ascrew-threaded end portion according to conventional practice for whichreason the same has not been illustrated in the accompanying drawings,

The male portion l is provided with a circumscribing and projectingshoulder 3 upon the four right angled surfaces thereof so that the dollyportion 4 is of somewhat reduced crosssection in comparison with theupper portion 5 according to the thickness of the shoulder. It will alsobe seen that the lower end 6 of the dolly portion converges ordiminishes upon the four sides thereof.

Upon the opposed wall surfaces 1 of the portion 5, I provide the pair ofopposed recesses 8 which open onto the shoulder 3, these recesses beingintended to receive the wing-lugs 9, 9' which project from the upper,open perimeter I0 of the socket II which forms part of the aforesaidpoint collectively designated 2.

The point 2 may also be considered, as will be apparent by reference tothe accompanying drawings, as a ferrule consisting of the aforesaidsocket and the pointed end I2 coterminus therewith, and it is to beunderstood that the ferrule aforesaid is squared like the male portionI.

The perimeter Ill of the socket ll abuts the shoulder 3, and in thisposition, when the winglugs 9 and 9' are hammered inwardly, it will beapparent that a binding engagement may be secured between the two mainparts. Conversely, when the wing-lugs are pried outwardly with a hammerand chisel, the female portion can easily be removed by a slight tapwith the chisel downwardly upon a portion of the wing-lugs 9 and 9' forresharpening or replacement.

Since various modifications can be made in my invention as hereinabovedescribed and many apparently widely different embodiments of same madewithin the spirit and scope of the claim without departing from suchspirit and scope, it is intended that all matter contained in theaccompanying specification shall be interpreted as illustrative only andnot in a limiting sense.

What I claim as my invention is:

A harrow tooth comprising in combination a male portion permanentlysecured to the harrow framework and a removable female point engageabletherewith, said male portion having a circumscribing projecting shoulderthereon and a pair of opposed recesses formed in the wall thereof andopening onto said shoulder, said point comprising a ferrule consistingof an elongated socket into which said male portion is receivable, theopen end of said socket abutting said shoulder, a pair of wing-lugsprojecting from the open end of said socket capable of being hammeredinto frictional engagement with said recesses and of being priedoutwardly to effect disengagement of said female point from said maleportion, and a pointed end coterminus with said socket.

THOMAS GRAY.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,119,248 Daly Dec. 1, 1914FOREIGN PATENTS Number Country Date 452,174 Great Britain Aug. 18, 1936

